actually i feel odd, about airtel for our fellow. because there is rare complaint for airtel recharge since from information i know airtel is biggest transaction part in most otomax user in india.
since i'm not in india, please contact other otomax fellow member to helping.
there is some possibility
1. parsing not correct
2. setting of response from provider is not correct but can be fixed and tested by response tester
3. Modem faulty